<x-row>
  <x-col span="8">
    <x-input label="用户名"></x-input>
  </x-col>
</x-row>
<x-row>
  <x-col span="8">
    <x-input label="用户名" direction="column-reverse"></x-input>
  </x-col>
</x-row>
<x-row>
  <x-col span="8">
    <x-input label="用户名" direction="row"></x-input>
  </x-col>
</x-row>
<x-row>
  <x-col span="8">
    <x-input label="用户名" direction="row-reverse"></x-input>
  </x-col>
</x-row>
